/Engine/Source/Runtime/FieldNotification/Public/INotifyFieldValueChanged.h
Add a delegate that will be notified when the FieldId is value changed.
[FDelegateHandle](API\Runtime\Core\Delegates\FDelegateHandle) AddFieldValueChangedDelegate ( [UE::FieldNotification::FFieldId](API\Runtime\FieldNotification\FFieldId) InFieldId, [FFieldValueChangedDelegate](API\Runtime\FieldNotification\INotifyFieldValueChanged\FFieldValueChangedDelegate) InNewDelegate )